Micca origen+ - Gain Switch Explained; Device Inputs; USB Input Connection; Optical S;PDIF Input Connection

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4.2.4 Gain Switch

The gain switch adjusts the output level of the OriGen+ as needed to properly drive the attached

device or headphones. The maximum output signal level corresponding to the gain switch

setting is as follows:

Setting

Output Levels

0dB

5.6Vrms for all analog outputs

10dB

1.7Vrms for all analog outputs

The 0dB setting is suitable for driving amplifiers with low input sensitivity, or headphones with

low efficiency and/or high impedance. Always start with the gain switch in the -10dB setting and

the volume control at the 9 o’clock position. Switch to the 0dB position only when needed.

4.3 Inputs

4.3.1 USB Input

The micro USB input jack is used to connect the OriGen+ to a computer’s USB connector. Make

sure that the OriGen+ is connected to a USB jack on the computer. If using a desktop computer,

make sure to use one of the rear USB jacks. Use only the USB cable that came with the

OriGen+. It’s not a magical cable, but it is a good quality cable that we know works. Set the

input selector switch to USB when using USB as the signal input.

The USB input also functions when used with compatible mobile devices that support OTG USB

Audio. Since support for OTG USB Audio is not universal, this functionality is dependent on the

specific mobile device and is therefore provide only on an as-is basis. Because the USB port on

most mobile devices does not provide power output, a separate 5V DC power adapter (not

included) will be needed for this functionality.

4.3.2 Optical S/PDIF Input

The OriGen+ Optical S/PDIF input accepts PCM signals up to 24-bit/192kHz from devices such

as computers, DVD players, TVs, and etc. Set the input selector switch to Optical when using

Optical as the signal input.

When using the Optical S/PDIF input, the OriGen+ must be powered either through the USB

jack, or the DC input jack. Any USB power source, such as a computer USB port, or USB phone

charger is acceptable.

Please note that the LED indicators for PCM/DSD and bit rate only show information for the

USB input and therefore will not display information for the Optical S/PDIF input.

4.3.3 DC Input Jack

The DC input jack accepts 5 volt DC power adapters (not included) for use when the OriGen+ is

attached to a compatible mobile device through an OTG USB Audio connection. While it is

possible to use the DC input jack to power the OriGen+ when using the Optical input, it’s more

convenient to use the USB port for power instead.